2-Naphthalenesulfonic acid, 6-2,4-dihydroxy-3-(4-nitrophenyl)azophenylazo-4-hydroxy-3-(2-hydroxy-3-nitro-5-sulfophenyl)azo-, disodium salt

disodium 6-[[2,4-dihydroxy-3-[(4-nitrophenyl)azo]phenyl]azo]-4-hydroxy-3-[(2-hydroxy-3-nitro-5-sulphonatophenyl)azo]naphthalene-2-sulphonate

6-[[2,4-Dihydroxy-3-[(4-nitrophenyl)azo]phenyl]azo]-4-hydroxy-3-[(2-hydroxy-3-nitro-5-sulfophenyl)azo]-2-naphthalenesulfonic acid disodium salt